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Well today one of our client server had worst ddos attack against server main IP. While analyzing i found it is coming from amazon hacked servers. As amazon is offering free ec2 servers for 1 year so some of people don’t care about it after getting it as free. They do not use it and forget it after getting it. These servers are easy to get hacked and then can be used to attack other servers by hackers.

Here is the quick solution for linux centos 7 to deal with these attacks: